The Wizard's Dog Series by Eric Kahn Gale

Meet Nosewise. He’s spunky. He’s curious. And he’s a dog who can’t understand why his pack mates Merlin and Morgana spend all day practicing magic tricks. If it’s a trick they want, he’s the dog to ask! He can already Sit!, Stay!, and Roll Over! But there’s no way Nosewise is Stay!ing when his master and best friend, Merlin, is kidnapped... moreMeet Nosewise. He’s spunky. He’s curious. And he’s a dog who can’t understand why his pack mates Merlin and Morgana spend all day practicing magic tricks. If it’s a trick they want, he’s the dog to ask! He can already Sit!, Stay!, and Roll Over! But there’s no way Nosewise is Stay!ing when his master and best friend, Merlin, is kidnapped. There’s nothing Nosewise won’t do to get Merlin back, even if it means facing the strange Fae people and their magic-eating worms, or tangling with the mysterious Sword in the Stone. But it may take more than sniffing out a spell to do it! Nosewise’s hilarious escapades and steadfast loyalty get him and his companions through King Arthur’s Dark Ages. less

When Lord Oberon's evil worms threaten to eat all magic in existence, Nosewise, the talking dog and wizard-in-training, and his human pack, the street urchin Arthur, the sorceress Morgana, and his beloved master Merlin, must find the Holy Grail, the one item that can save them all.